Difference between revisions of "Java-Business-Application/C2/Servlet-Methods/English-timed"

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(Created page with '{| border =1 | Time | Narration |- | 00.01 | Welcome to the spoken-tutorial on '''Servlet Methods.''' |- |00.06 | In this tutorial we will learn to |- | 00.08 | create a simp…')
 
 
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{| border =1
 
{| border =1
−
| Time
+
| '''Time'''
−
| Narration
+
| '''Narration'''
  
 
|-
 
|-
−
| 00.01
+
| 00:01
−
| Welcome to the spoken-tutorial on  '''Servlet Methods.'''
+
| Welcome to the '''spoken-tutorial''' on  '''Servlet Methods.'''
  
 
|-
 
|-
−
|00.06
+
|00:06
−
| In this tutorial we will learn to
+
| In this tutorial, we will learn to:
  
 
|-
 
|-
−
| 00.08
+
|00:08
−
| create a simple login form using '''JSP'''
+
|create a simple '''login form''' using '''JSP'''
  
 
|-
 
|-
−
| 00.13
+
|00:13
−
| Pass parameters using '''doGet''' '''method'''
+
|Pass parameters using '''doGet''' '''method'''
  
 
|-
 
|-
−
| 00.16
+
|00:16
−
| Pass parameters using '''doPost method'''
+
|Pass parameters using '''doPost method'''
  
 
|-
 
|-
−
| 00.20
+
|00:20
−
| Difference between''' doGet '''and '''doPost''' methods
+
|Difference between '''doGet '''and '''doPost''' methods.
  
 
|-
 
|-
−
|00.25
+
|00:25
−
|Here we are using
+
|Here we are using:'''Ubuntu '''Version '''12.04'''
  
 
|-
 
|-
−
| 00.26
+
| 00:30
−
| Ubuntu Version 12.04
+
| '''Netbeans IDE''' 7.3
  
 
|-
 
|-
−
| 00.30
+
| 00:33
−
| Netbeans IDE 7.3
+
| '''JDK''' 1.7
  
 
|-
 
|-
−
| 00.33
+
| 00:36
−
| JDK 1.7
+
| '''Firefox''' web-browser 21.0.
  
 
|-
 
|-
−
| 00.36
+
| 00:39
−
| Firefox web-browser 21.0
+
−
 
+
−
|-
+
−
| 00.39
+
 
|You can use any web-browser of your choice.
 
|You can use any web-browser of your choice.
  
 
|-
 
|-
−
| 00.43
+
| 00:43
−
| To follow this tutorial you must know  
+
| To follow this tutorial, you must know:
  
 
|-
 
|-
−
| 00.46
+
| 00:46
−
| Core Java using '''Netbeans IDE'''  
+
|Core Java using '''Netbeans IDE'''  
  
 
|-
 
|-
−
| 00.49
+
|00:49
−
| '''HTML'''
+
|'''HTML'''
  
 
|-
 
|-
−
| 00.51
+
|00:51
−
| Basics of '''Java Servlets '''and '''JSPs'''
+
|Basics of '''Java Servlets '''and '''JSPs'''.
  
 
|-
 
|-
−
| 00.56
+
| 00:56
−
|If not, for relevant tutorials please visit our website.
+
|If not, for relevant tutorials, please visit our website.
  
 
|-
 
|-
−
| 01.00
+
| 01:00
 
| We will begin by creating our web application- the '''Library Management System.'''
 
| We will begin by creating our web application- the '''Library Management System.'''
−
 
  
 
|-
 
|-
−
| 01.06
+
| 01:06
−
|First, we will create the '''home page.'''
+
|First, we will create the '''Home page.'''
−
 
+
  
 
|-
 
|-
−
| 01.09
+
| 01:09
−
|The '''home page''' will contain a simple '''login form'''.
+
|The '''Home page''' will contain a simple '''login form'''.
−
 
+
  
 
|-
 
|-
−
| 01.14
+
| 01:14
−
|It will allow authenticated users to login to the '''Library Management System.'''
+
|It will allow authenticated users to '''login''' to the '''Library Management System.'''
  
 
|-
 
|-
−
| 01.20
+
| 01:20
 
| Now, let us switch to '''Netbeans IDE.'''
 
| Now, let us switch to '''Netbeans IDE.'''
  
 
|-
 
|-
−
| 01.23
+
| 01:23
−
| Let us go to the '''index '''''dot '''''jsp '''page, that we had already modified earlier.
+
| Let us go to the '''index ''' '''dot''' '''jsp''' page that we had already modified earlier.
  
 
|-
 
|-
−
| 01.30
+
| 01:30
 
| I have modified this page to create our '''home page.'''
 
| I have modified this page to create our '''home page.'''
  
 
|-
 
|-
−
| 01.35
+
| 01:35
 
| We keep the '''title '''as '''Home Page.'''
 
| We keep the '''title '''as '''Home Page.'''
  
 
|-
 
|-
−
| 01.38
+
| 01:38
−
| Inside the body, we have a '''table, '''with '''border '''''equal to '''''1.'''
+
| Inside the body, we have a '''table''' with '''border''' equal to '''1.'''
  
 
|-
 
|-
−
| 01.44
+
| 01:44
 
|You can have a look at the code here.
 
|You can have a look at the code here.
  
 
|-
 
|-
−
| 01.47
+
| 01:47
−
| Inside the '''table, '''we have included a '''heading, Welcome to Library Management System.'''
+
| Inside the '''table''', we have included a heading '''Welcome to Library Management System.'''
  
 
|-
 
|-
−
| 01.54
+
| 01:54
−
| Next, we have '''paragraph tag '''that includes, '''This is the home page for Library Management System.'''
+
| Next, we have a '''paragraph tag''' that includes ''' "This is the home page for Library Management System".'''
  
 
|-
 
|-
−
| 02.03
+
| 02:03
−
| Then, we have a '''hyperlink, '''which links to a page called '''visitorHomePage '''''dot '''''jsp.'''
+
| Then we have a '''hyperlink''' which links to a '''page''' called '''visitorHomePage dot jsp.'''
  
 
|-
 
|-
−
| 02.11
+
| 02:11
 
| We will create this page later.
 
| We will create this page later.
  
 
|-
 
|-
−
| 02.13
+
| 02:13
−
| Next,we have a very simple''' login form.'''
+
| Next, we have a very simple '''login form.'''
  
 
|-
 
|-
−
| 02.18
+
| 02:18
 
|This form allows a '''registered user''' to '''login''' .
 
|This form allows a '''registered user''' to '''login''' .
  
 
|-
 
|-
−
| 02.22
+
| 02:22
−
| Before creating the '''form ''' you will have to create a '''servlet '''named '''GreetingServlet.'''
+
| Before creating the '''form ''', you will have to create a '''servlet '''named '''GreetingServlet.'''
  
 
|-
 
|-
−
| 02.28
+
| 02:28
−
| Pause the tutorial and create a new '''servlet '''as explained in the earlier tutorial.  
+
| So, pause the tutorial here and create a new '''servlet''' as explained in the earlier tutorial.  
  
 
|-
 
|-
−
| 02.35
+
| 02:35
−
| Note that the '''servlet name '''is '''GreetingServlet.'''
+
| Note that the '''servlet''' name is '''GreetingServlet'''and
  
 
|-
 
|-
−
| 02.39
+
| 02:39
−
|The '''URL pattern '''should be '''GreetingServletPath.'''
+
|the '''URL pattern''' should be '''GreetingServletPath.'''
  
 
|-
 
|-
−
| 02.44
+
| 02:44
−
| This''' form''' has two input elements - '''Username and Password.'''
+
| This''' form''' has two '''input elements''' - '''Username''' and '''Password.'''
  
 
|-
 
|-
−
| 02.50
+
| 02:50
 
|It also has a '''Submit button''' that says '''Sign In.'''
 
|It also has a '''Submit button''' that says '''Sign In.'''
  
 
|-
 
|-
−
| 02.55
+
| 02:55
−
| Next, we have a '''paragraph tag ''' that includes a link to '''addUser.jsp.'''
+
| Next, we have a '''paragraph tag''' that includes a '''link''' to '''addUser.jsp.'''
  
 
|-
 
|-
−
| 03.03
+
| 03:03
−
|This is the''' registration page''' for those '''users''' who have not yet registered.
+
|This is the '''registration page''' for those '''users''' who have not yet registered.
  
 
|-
 
|-
−
| 03.09
+
| 03:09
−
| Now, let us go to our GreetingServlet.java.  
+
| Now, let us go to our '''GreetingServlet.java. '''
  
 
|-
 
|-
−
| 03.14
+
| 03:14
−
| Note that '''GreetingServlet.java '''is created in the same package '''org.spokentutorial.'''
+
| Note that '''GreetingServlet.java''' is created in the same package '''org.spokentutorial.'''
  
 
|-
 
|-
−
| 03.23
+
| 03:23
 
| Now, this '''servlet '''will be able to access the '''form data '''from the '''request object.'''
 
| Now, this '''servlet '''will be able to access the '''form data '''from the '''request object.'''
  
 
|-
 
|-
−
| 03.30
+
| 03:30
 
| This '''servlet '''will act as a '''controller.'''
 
| This '''servlet '''will act as a '''controller.'''
−
 
  
 
|-
 
|-
−
| 03.33
+
| 03:33
−
|Do you recall that we had come across '''controller '''earlier?
+
|Do you recall that we had come across '''controller''' earlier?
  
 
|-
 
|-
−
| 03.38
+
| 03:38
 
| Now, we will see what the '''servlet '''does as a '''controller.'''
 
| Now, we will see what the '''servlet '''does as a '''controller.'''
  
 
|-
 
|-
−
| 03.42
+
| 03:42
 
|The '''form data''' will reside in the '''request object.'''
 
|The '''form data''' will reside in the '''request object.'''
−
 
  
 
|-
 
|-
−
| 03.46
+
| 03:46
−
|The first task is to retrieve the '''form''' data parameters.
+
|The first task is to retrieve the '''form''' '''data''' parameters.
  
 
|-
 
|-
−
| 03.51
+
| 03:51
 
|This is done using the '''getParameter method '''on the '''request object.'''
 
|This is done using the '''getParameter method '''on the '''request object.'''
  
 
|-
 
|-
−
| 03.57
+
| 03:57
 
| So, let us switch to '''Netbeans IDE.'''
 
| So, let us switch to '''Netbeans IDE.'''
  
 
|-
 
|-
−
| 04.02
+
| 04:02
−
| Type inside the''' doGet method,'''  
+
| Type inside the''' doGet method''':
  
 
|-
 
|-
−
| 04.04
+
| 04:04
−
|'''PrintWriter space out equal to response dot getWriter.'''''
+
|'''PrintWriter space out equal to response dot getWriter().'''
  
 
|-
 
|-
−
| 04.14
+
| 04:14
−
| Next, we will retrieve the '''form data '''parameters.
+
| Next, we will retrieve the '''form data''' '''parameters'''.
  
 
|-
 
|-
−
| 04.18
+
| 04:18
−
| So that on the next line type,  
+
| So that on the next line, type:
  
 
|-
 
|-
−
| 04.20
+
| 04:20
−
|'''String ''space '''username'''   equal to '''request'''  dot '''getParameter ''' within brackets and double quotes '''userName'''semicolon.
+
| '''String''' space '''username''' equal to '''request'''  dot '''getParameter ''' within brackets and double quotes '''userName''' and '''semicolon'''.
  
 
|-
 
|-
−
| 04.35
+
| 04:35
−
|Note that this '''userName '''is the name we have included in the '''form tag '''for '''User Name.'''
+
|Note that this '''userName '''is the name we have included in the '''form tag''' for '''User Name.'''
  
 
|-
 
|-
−
| 04.43
+
| 04:43
−
| Similarly, we will retrieve the '''password''' also.
+
| Similarly, we will retrieve the password also.
  
 
|-
 
|-
−
| 04.48
+
| 04:48
−
|So on the next line, type, '''String ''' space '''password''' equal to '''request''' dot '''getParameter ''' within brackets and double quotes '''password''' semicolon.
+
|So, on the next line, type: '''String ''' space '''password''' equal to '''request''' dot '''getParameter ''' within brackets and double quotes '''password''' semicolon.
  
 
|-
 
|-
−
| 05.03
+
| 05:03
−
| Next, we will print the '''User Name '''in the '''output'''.
+
| Next, we will print the '''UserName '''in the '''output'''.
  
 
|-
 
|-
−
| 05.08
+
| 05:08
−
| So, on the next line type  
+
| So, on the next line, type:
  
 
|-
 
|-
−
| 05.10
+
| 05:10
−
|'''out ''dot '''println''' within brackets and double quotes ''' Hello from GET Method plus username.'''
+
|'''out''' dot '''println''' within brackets and double quotes ''' Hello from GET Method''' plus '''username.'''
  
 
|-
 
|-
−
|05.21
+
|05:21
−
| Now, to run this project, right-click on '''MyFirstProject. '''
+
| Now, to '''run''' this '''project''', right-click on '''MyFirstProject. '''
  
 
|-
 
|-
−
| 05.27
+
| 05:27
 
| Click on '''Clean and Build.'''
 
| Click on '''Clean and Build.'''
  
 
|-
 
|-
−
| 05.29
+
| 05:29
−
| Again right click on '''MyFirstProject ''',  click on '''Run.'''
+
| Again right-click on '''MyFirstProject ''',  click on '''Run.'''
  
 
|-
 
|-
−
| 05.35
+
| 05:35
 
| So, the '''server '''is up and running.
 
| So, the '''server '''is up and running.
  
 
|-
 
|-
−
| 05.38
+
| 05:38
 
|It has deployed '''MyFirstProject.'''
 
|It has deployed '''MyFirstProject.'''
  
 
|-
 
|-
−
| 05.41
+
| 05:41
−
|We have got our '''home page '''displayed in the '''browser'''.
+
|We have got our '''Home page '''displayed in the '''browser'''.
  
 
|-
 
|-
−
| 05.45
+
| 05:45
−
| Observe that the '''title '''of the page is '''Home Page.'''
+
| Observe that the title of the '''page''' is '''Home Page.'''
  
 
|-
 
|-
−
| 05.50
+
| 05:50
 
| We can see a very simple '''login form''' here.
 
| We can see a very simple '''login form''' here.
  
 
|-
 
|-
−
| 05.54
+
| 05:54
 
| Let me enter the '''Username '''and '''Password.'''
 
| Let me enter the '''Username '''and '''Password.'''
  
 
|-
 
|-
−
| 05.58
+
| 05:58
 
| I will type '''arya '''as the '''Username.'''
 
| I will type '''arya '''as the '''Username.'''
  
 
|-
 
|-
−
| 06.02
+
| 06:02
 
| And '''arya*123 '''as the '''Password.'''
 
| And '''arya*123 '''as the '''Password.'''
  
 
|-
 
|-
−
|06.06
+
|06:06
 
| Then click on '''Sign In.'''
 
| Then click on '''Sign In.'''
  
 
|-
 
|-
−
| 06.09
+
| 06:09
 
| We can see that we have got the output '''Hello from GET Method''' '''arya'''.
 
| We can see that we have got the output '''Hello from GET Method''' '''arya'''.
  
 
|-
 
|-
−
| 06.15
+
| 06:15
−
| Now, the '''user '''was able to login here because we have not included any validation inside the code.  
+
| Now, the '''user '''was able to '''login''' here because we have not included any validation inside the code.  
  
 
|-
 
|-
−
| 06.24
+
| 06:24
 
| We will do this in the later tutorial.  
 
| We will do this in the later tutorial.  
  
 
|-
 
|-
−
| 06.28
+
| 06:28
 
| Now, have a look at the '''URL '''here.
 
| Now, have a look at the '''URL '''here.
  
 
|-
 
|-
−
| 06.31
+
| 06:31
−
|It is '''localhost '''''colon '''''8080 '''''slash '''''MyFirstProject '''''slash '''''GreetingServletPath '''''question mark '''''userName '''''equal to '''''arya and password '''''equal to '''''arya *123.
+
|It is '''localhost ''' colon '''8080 ''' slash '''MyFirstProject ''' slash '''GreetingServletPath ''' question mark '''userName ''' equal to '''arya''' and '''password ''' equal to '''arya *123'''.
  
 
|-
 
|-
−
| 06.49
+
| 06:49
−
|Now, '''form data '''is separated from the page information by a '''question mark.'''
+
|Now, the '''form data '''is separated from the '''page''' information by a question mark.
  
 
|-
 
|-
−
|06.56
+
|06:56
−
| We can see that '''username '''and '''password '''that we had entered in the form is inside the URL also.
+
| We can see that the '''username '''and '''password '''that we had entered in the '''form''' are inside the URL also.
  
 
|-
 
|-
−
| 07.05
+
| 07:05
−
| Now, let us try to do the same using '''POST Method.'''
+
| Now let us try to do the same, using '''POST Method.'''
  
 
|-
 
|-
−
| 07.10
+
| 07:10
 
| So, switch back to the '''IDE.'''
 
| So, switch back to the '''IDE.'''
  
 
|-
 
|-
−
| 07.12
+
| 07:12
−
| Copy the code we had written for  '''doGet Method '''and paste in the '''doPost Method.'''
+
| Copy the code we had written for  '''doGet method '''and paste in the '''doPost method.'''
  
 
|-
 
|-
−
| 07.20
+
| 07:20
 
| Now, change the '''println''' statement to '''Hello from POST Method.'''
 
| Now, change the '''println''' statement to '''Hello from POST Method.'''
  
 
|-
 
|-
−
|07.27
+
|07:27
−
| Now, let us open '''index''' dot '''jsp.'''
+
| Now, let us open '''index dot jsp.'''
  
 
|-
 
|-
−
| 07.31
+
| 07:31
−
| Here, we must change the '''method attribute '''of the '''form tag '''to '''POST.'''
+
| Here, we must change the '''method attribute''' of the '''form tag '''to '''POST.'''
  
 
|-
 
|-
−
| 07.37
+
| 07:37
 
|You can have a look at this code now.
 
|You can have a look at this code now.
  
 
|-
 
|-
−
| 07.42
+
| 07:42
−
|We have '''form action '''''equal to '''''GreetingServletPath method '''''equal to '''''POST.'''
+
|We have '''form action ''' equal to '''GreetingServletPath''' '''method ''' equal to '''POST.'''
  
 
|-
 
|-
−
| 07.49
+
| 07:49
−
| Now, we will run this Project again
+
| Now, we will '''run''' this '''Project''' again.
  
 
|-
 
|-
−
| 07.53
+
| 07:53
−
| So, Right click on '''MyFirstProject '''and click on '''Run'''
+
| So, right-click on '''MyFirstProject '''and click on '''Run'''.
  
 
|-
 
|-
−
| 07.58
+
| 07:58
−
| We have got an output similar to the one we got, when we used the '''GET method.'''
+
| We have got the output similar to the one we got when we used the '''GET method.'''
  
 
|-
 
|-
−
| 08.04
+
| 08:04
−
| So let us type  '''User Name '''and '''Password '''again.
+
| So, let us type  '''UserName '''and '''Password '''again.
  
 
|-
 
|-
−
| 08.08
+
| 08:08
 
| Then click on '''Sign In.'''
 
| Then click on '''Sign In.'''
  
 
|-
 
|-
−
| 08.12
+
| 08:12
 
| Note that we have got '''Hello from POST Method arya.'''
 
| Note that we have got '''Hello from POST Method arya.'''
  
 
|-
 
|-
−
| 08.17
+
| 08:17
 
| Now, take a look at the '''URL.'''
 
| Now, take a look at the '''URL.'''
  
 
|-
 
|-
−
| 08.19
+
| 08:19
−
|It is '''localhost '''''colon '''''8080 '''''slash '''''MyFirstProject '''''slash '''''GreetingServletPath '''
+
|It is '''localhost colon 8080 slash MyFirstProject slash GreetingServlet Path'''.
  
 
|-
 
|-
−
| 08.25
+
| 08:25
−
| Here we do not see the '''form data '''in the '''URL '''of the '''request.'''
+
| Here, we do not see the '''form data '''in the '''URL '''of the '''request.'''
  
 
|-
 
|-
−
| 08.30
+
| 08:30
−
| This is the major difference between '''doGet '''and '''doPost Methods.'''
+
| This is the major difference between '''doGet '''and '''doPost methods.'''
  
 
|-
 
|-
−
| 08.35
+
| 08:35
−
| Now, let us learn when to use '''GET '''and when to use '''POST Methods.'''
+
| Now, let us learn when to use '''GET '''and when to use '''POST methods.'''
  
 
|-
 
|-
−
| 08.42
+
| 08:42
−
|'''GET Method '''is used when:
+
|'''GET method '''is used when:
  
 
|-
 
|-
−
| 08.44
+
| 08:44
−
| the '''form '''is small and hence the '''data '''is less.
+
|the '''form '''is small and hence the '''data '''is less.
  
 
|-
 
|-
−
| 08.48
+
| 08:48
−
| the '''user''' wants the contents of the data to be visible in the '''URL.'''
+
|the '''user''' wants the contents of the data to be visible in the '''URL.'''
  
 
|-
 
|-
−
| 08.53
+
| 08:53
−
|'''POST Method '''is used when:
+
|'''POST method '''is used when:
  
 
|-
 
|-
−
| 08.55
+
| 08:55
−
| the '''form '''is large and hence the '''data '''is more.
+
|the '''form '''is large and hence the '''data '''is more.
  
 
|-
 
|-
−
| 09.00
+
| 09:00
−
| the '''user''' does not want the contents of the data to be visible in the '''URL.'''
+
|the '''user''' does not want the contents of the data to be visible in the '''URL.'''
  
 
|-
 
|-
−
| 09.06
+
| 09:06
 
|ex: '''passwords'''
 
|ex: '''passwords'''
  
 
|-
 
|-
−
| 09.08
+
| 09:08
 
| Let us summarize.
 
| Let us summarize.
  
 
|-
 
|-
−
| 09.10
+
| 09:10
 
|In this tutorial we have learnt to:
 
|In this tutorial we have learnt to:
  
 
|-
 
|-
−
| 09.12
+
| 09:12
−
| create a simple login form using '''JSP'''
+
|create a '''simple login form''' using '''JSP'''
  
 
|-
 
|-
−
| 09.16
+
| 09:16
−
| Pass parameters using '''doGet''' '''method'''
+
|Pass parameters using '''doGet''' '''method'''
  
 
|-
 
|-
−
| 09.19
+
| 09:19
−
| Pass parameters using '''doPost method'''
+
|Pass parameters using '''doPost method'''
  
 
|-
 
|-
−
| 09.22
+
| 09:22
−
| Difference between''' doGet '''and '''doPost''' methods
+
|Difference between''' doGet '''and '''doPost''' methods.
  
 
|-
 
|-
−
| 09.26
+
| 09:26
 
| Please make sure that you have completed this tutorial before proceeding further.
 
| Please make sure that you have completed this tutorial before proceeding further.
  
 
|-
 
|-
−
| 09.32
+
| 09:32
 
| Watch the video available at the following link.
 
| Watch the video available at the following link.
  
 
|-
 
|-
−
| 09.35
+
| 09:35
−
| It summarizes the Spoken Tutorial Project
+
| It summarizes the Spoken Tutorial Project.
  
 
|-
 
|-
−
| 09.38
+
| 09:38
−
|If you do not have good bandwidth you can download and watch it
+
|If you do not have good bandwidth, you can download and watch it.
  
 
|-
 
|-
−
|09.42
+
|09:42
−
| The Spoken Tutorial Project Team
+
| The Spoken Tutorial Project Team:
  
 
|-
 
|-
−
| 09.45
+
| 09:45
−
| Conducts workshops using spoken tutorials
+
| Conducts workshops using spoken tutorials.
  
 
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| Gives certificates for those who pass an online test
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| Gives certificates for those who pass an online test.
  
 
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| For more details please write to contact at spoken hyphen tutorial dot org
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| For more details please write to: contact at spoken hyphen tutorial dot org.
  
 
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| Spoken Tutorial Project is a part of the Talk to a Teacher Project
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| Spoken Tutorial Project is a part of the "Talk to a Teacher" Project.
  
 
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| It is supported by the National Mission on Education through ICT, MHRD, Government of India
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| It is supported by the National Mission on Education through ICT, MHRD, Government of India.
 
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| More information on this mission is available at http://spoken-tutorial.org/NMEICT-Intro
 
| More information on this mission is available at http://spoken-tutorial.org/NMEICT-Intro
  
 
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| The Library Management System has been contributed by a leading software MNC, through their Corporate Social Responsibility Programme.
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| The '''Library Management System''' has been contributed by a leading software MNC through their "Corporate Social Responsibility Programme".
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|They have also validated the content for this spoken tutorial.
 
|They have also validated the content for this spoken tutorial.
  
 
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|This is Arya Ratish from IIT Bombay signing off.
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|This is Arya Ratish from IIT Bombay, signing off. Thank you for joining.
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Thank you for joining.
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Latest revision as of 16:50, 9 March 2017

Time Narration
00:01 Welcome to the spoken-tutorial on Servlet Methods.
00:06 In this tutorial, we will learn to:
00:08 create a simple login form using JSP
00:13 Pass parameters using doGet method
00:16 Pass parameters using doPost method
00:20 Difference between doGet and doPost methods.
00:25 Here we are using:Ubuntu Version 12.04
00:30 Netbeans IDE 7.3
00:33 JDK 1.7
00:36 Firefox web-browser 21.0.
00:39 You can use any web-browser of your choice.
00:43 To follow this tutorial, you must know:
00:46 Core Java using Netbeans IDE
00:49 HTML
00:51 Basics of Java Servlets and JSPs.
00:56 If not, for relevant tutorials, please visit our website.
01:00 We will begin by creating our web application- the Library Management System.
01:06 First, we will create the Home page.
01:09 The Home page will contain a simple login form.
01:14 It will allow authenticated users to login to the Library Management System.
01:20 Now, let us switch to Netbeans IDE.
01:23 Let us go to the index dot jsp page that we had already modified earlier.
01:30 I have modified this page to create our home page.
01:35 We keep the title as Home Page.
01:38 Inside the body, we have a table with border equal to 1.
01:44 You can have a look at the code here.
01:47 Inside the table, we have included a heading Welcome to Library Management System.
01:54 Next, we have a paragraph tag that includes "This is the home page for Library Management System".
02:03 Then we have a hyperlink which links to a page called visitorHomePage dot jsp.
02:11 We will create this page later.
02:13 Next, we have a very simple login form.
02:18 This form allows a registered user to login .
02:22 Before creating the form , you will have to create a servlet named GreetingServlet.
02:28 So, pause the tutorial here and create a new servlet as explained in the earlier tutorial.
02:35 Note that the servlet name is GreetingServletand
02:39 the URL pattern should be GreetingServletPath.
02:44 This form has two input elements - Username and Password.
02:50 It also has a Submit button that says Sign In.
02:55 Next, we have a paragraph tag that includes a link to addUser.jsp.
03:03 This is the registration page for those users who have not yet registered.
03:09 Now, let us go to our GreetingServlet.java.
03:14 Note that GreetingServlet.java is created in the same package org.spokentutorial.
03:23 Now, this servlet will be able to access the form data from the request object.
03:30 This servlet will act as a controller.
03:33 Do you recall that we had come across controller earlier?
03:38 Now, we will see what the servlet does as a controller.
03:42 The form data will reside in the request object.
03:46 The first task is to retrieve the form data parameters.
03:51 This is done using the getParameter method on the request object.
03:57 So, let us switch to Netbeans IDE.
04:02 Type inside the doGet method:
04:04 PrintWriter space out equal to response dot getWriter().
04:14 Next, we will retrieve the form data parameters.
04:18 So that on the next line, type:
04:20 String space username equal to request dot getParameter within brackets and double quotes userName and semicolon.
04:35 Note that this userName is the name we have included in the form tag for User Name.
04:43 Similarly, we will retrieve the password also.
04:48 So, on the next line, type: String space password equal to request dot getParameter within brackets and double quotes password semicolon.
05:03 Next, we will print the UserName in the output.
05:08 So, on the next line, type:
05:10 out dot println within brackets and double quotes Hello from GET Method plus username.
05:21 Now, to run this project, right-click on MyFirstProject.
05:27 Click on Clean and Build.
05:29 Again right-click on MyFirstProject , click on Run.
05:35 So, the server is up and running.
05:38 It has deployed MyFirstProject.
05:41 We have got our Home page displayed in the browser.
05:45 Observe that the title of the page is Home Page.
05:50 We can see a very simple login form here.
05:54 Let me enter the Username and Password.
05:58 I will type arya as the Username.
06:02 And arya*123 as the Password.
06:06 Then click on Sign In.
06:09 We can see that we have got the output Hello from GET Method arya.
06:15 Now, the user was able to login here because we have not included any validation inside the code.
06:24 We will do this in the later tutorial.
06:28 Now, have a look at the URL here.
06:31 It is localhost colon 8080 slash MyFirstProject slash GreetingServletPath question mark userName equal to arya and password equal to arya *123.
06:49 Now, the form data is separated from the page information by a question mark.
06:56 We can see that the username and password that we had entered in the form are inside the URL also.
07:05 Now let us try to do the same, using POST Method.
07:10 So, switch back to the IDE.
07:12 Copy the code we had written for doGet method and paste in the doPost method.
07:20 Now, change the println statement to Hello from POST Method.
07:27 Now, let us open index dot jsp.
07:31 Here, we must change the method attribute of the form tag to POST.
07:37 You can have a look at this code now.
07:42 We have form action equal to GreetingServletPath method equal to POST.
07:49 Now, we will run this Project again.
07:53 So, right-click on MyFirstProject and click on Run.
07:58 We have got the output similar to the one we got when we used the GET method.
08:04 So, let us type UserName and Password again.
08:08 Then click on Sign In.
08:12 Note that we have got Hello from POST Method arya.
08:17 Now, take a look at the URL.
08:19 It is localhost colon 8080 slash MyFirstProject slash GreetingServlet Path.
08:25 Here, we do not see the form data in the URL of the request.
08:30 This is the major difference between doGet and doPost methods.
08:35 Now, let us learn when to use GET and when to use POST methods.
08:42 GET method is used when:
08:44 the form is small and hence the data is less.
08:48 the user wants the contents of the data to be visible in the URL.
08:53 POST method is used when:
08:55 the form is large and hence the data is more.
09:00 the user does not want the contents of the data to be visible in the URL.
09:06 ex: passwords
09:08 Let us summarize.
09:10 In this tutorial we have learnt to:
09:12 create a simple login form using JSP
09:16 Pass parameters using doGet method
09:19 Pass parameters using doPost method
09:22 Difference between doGet and doPost methods.
09:26 Please make sure that you have completed this tutorial before proceeding further.
09:32 Watch the video available at the following link.
09:35 It summarizes the Spoken Tutorial Project.
09:38 If you do not have good bandwidth, you can download and watch it.
09:42 The Spoken Tutorial Project Team:
09:45 Conducts workshops using spoken tutorials.
09:48 Gives certificates for those who pass an online test.
09:52 For more details please write to: contact at spoken hyphen tutorial dot org.
09:58 Spoken Tutorial Project is a part of the "Talk to a Teacher" Project.
10:02 It is supported by the National Mission on Education through ICT, MHRD, Government of India.
10:09 More information on this mission is available at http://spoken-tutorial.org/NMEICT-Intro
10:19 The Library Management System has been contributed by a leading software MNC through their "Corporate Social Responsibility Programme".
10:28 They have also validated the content for this spoken tutorial.
10:32 This is Arya Ratish from IIT Bombay, signing off. Thank you for joining.

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14

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